Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bde70bc250c42d…

MALICIOUS

PDF

68.7 KB Created: 2021-04-04 04:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e371c76c94d98508928d1921280a061a SHA-1: ab15e8386e8b987b907f5baa8c363648d9f96557 SHA-256: c7bde70bc250c42d1114ad221b8cdf9ea58810754204d23e22a4900f21ee1223
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'Casio calculator fx-991ex manual', suggesting a lure to disguise malicious links. The presence of multiple disposable domains and link farm characteristics further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=casio+calculator+fx-+991ex+manual
    • http://opt05.ru/grand_opening_invitation_template_psdqdxri.pdf
    • https://static.s123-cdn-static.com/uploads/4464523/normal_5ffd4dc167f93.pdf
    • http://pifemukopisare.sportsontheweb.net/bearing_training_manual.pdf
    • http://torixewiser.medianewsonline.com/calendar_2020_template.pdf
    • https://cdn-cms.f-static.net/uploads/4421341/normal_600a210741409.pdf
    • http://copyrightsupport-ig.com/nikon_d3200_costco_bundle3cc0b.pdf
    • http://zedateve.mypressonline.com/anesthesiology_residency_interview_questions_and_answers.pdf
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/dusiwodi_dewidis_fuzisotoboku_takuwus.pdf
    • http://pobesegu.scienceontheweb.net/jikirasesasarafubaxori.pdf
    • http://tojuvapemupo.mywebcommunity.org/logical_reasoning_puzzles_for_cat.pdf
    • http://hardcreditcheck.info/tixisafiketibejse25.pdf
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/neroxukizokajokaki.pdf
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/zumunekow.pdf
    • http://vitetiw.getenjoyment.net/ielts_academic_practice_tests_2020.pdf
    • https://kesevure.weebly.com/uploads/1/3/4/4/134497963/1801883.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gutotoluderivi.rf.gd/bixemopidinopuviv.pdf
    • http://rosajeku.myartsonline.com/lisagumizawudototojixi.pdf
    • http://katudajug.epizy.com/neretaketiletupizamib.pdf
    • http://vebagakid.onlinewebshop.net/nicholas_sparks_latest_books_2018.pdf
    • http://nanodopikenu.rf.gd/lobitobisazipelale.pdf
    • http://tejizikadojuni.epizy.com/der_feinschmecker_weinguide_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11f.bin
136d788f128debb029c8e119f6ec057b917135cfc7f3d2ff46614c8f993cc550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD11F 5240 bytes
font_01_sfnt_off0000e2e8.bin
3bdc8dade3397a9c48d4cfcf372e23567198bdbc490479d83c50f3d635c8ca09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E8 10260 bytes

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